Portable rim-driven circular saw



June 3, 1952 s n- 2,599,495

I PORTABLE RIMDRIVEN CIRCULAR SAW Filed Sept. 5, 1946 2 SHEETSSHEET l qlbert P mith June 3, 1952 A. P. SMITH PORTABLE RIM-DRIVEN CIRCULAR SAW 2 SHEETS-SHEET 2 Filed Sept. 5, 1946 Patented June 3, 1952 PORTABLE RIM-DRIVEN CIRCULAR SAW Albert P. Smith, Ava, Mo., assignor, by mesne assignments, to Barker Saw Company, Springfield, Mo., a corporation of Missouri Application September 3, 1946, Serial No. 694,525 v 5 Claims. 1

The present invention is an improvement on the circular or ring saw for cutting logs crossways described in my co-pending application, Serial No. 603,771, filed July 9, 1945, and issued October 23, 1951, as Patent No. 2,572,065.

One object of this invention is to provide a saw of that class which is light enough to be handled by one man and rigid and strong enough to be applied in the proper place on a log by one hand, while the cutting action is controlled by the other hand.

This machine saw consists of four main parts, namely, first, a support, or anchoring member for securing the machine on a log, where the cut is to be made; second, a semi-circular frame hinged on the support and adapted for gradually increasing the depth of the cut; third, a guard secured on the frame over the saw teeth to protect the operator and guide the ring-shaped saw blade during operation; and fourth and last, the actuating mechanism for running the saw.

Other objects and advantages of the invention will be understood from the following description with the aid of the attached drawing which is part of the application.

Figure 1 is a side elevation of the circular saw;

Figure 2 is a top plan view of the anchoring member;

Figure 3 is a section on a plane along line 33 of Figure 1;

Figure 4 is a top plan view of the actuating mechanism as seen from line 4-4 of Figure 1 and in larger scale;

Figure 5 is a top plan view of Figure 1 showing the entire machine saw;

Figure 6 is a radial section on a plane along line 6-6 of Figure 1, showing roller bearings for the saw blade; and

Figure 7 is a similar view taken along line 7-1 of Figure 1 showing solid spacers.

The base member or anchoring support which is denoted by numeral I is shaped like a fork with two prongs II placed far enough apart to straddle the saw blade [2 in its curved guard l3 of L-shaped section to permit advancing of the saw blade to increase the depth of the cut in the log.

At the end of the prongs are provided hooks I4 for firmly holding the log I during operation, while the opposite end of the support It] is provided with a thumb screw I6 or other means for anchoring the rear end thereof on a stump or other fixed object in the ground.

It will be understood that the anchoring support In thus remains stationary during the entire 2 sawing operation, while the saw I2 itself can be raised or lowered on said support as the work proceeds.

The prongs II are slightly arched at 11, near their hooked ends, in order that the hooks I4 may be able to reach down on the offside of the log and not to rest on the top of the arched surface of the log. About, midway between the thumb screw I6 and the beginning of the forked portions II is shown a lug I8, witha bolt I9 which forms the fixed pivot point for the oscillatable parts of the machine. Curved on a radius from this pivot point I9, a stiff arm 20px tends upwardly from the left prong II and a guide strap 20a on the tube frame 23 isshown for the arm 20, which terminates with a handgrip 2|, by means of which the hooks can be pressed into the bark of the log I5 to keep the support anchored during the sawing operation.

The members II], II, l4, l1, I8, 20 and Zithus constitute a rigid unit which is preferably forged of iron and on which the saw proper is mounted to oscillate.

The moving parts of this machine saw which oscillate on the pivot I9 at'lug I8, comprise the ring saw blade I2, the guard I3, the tube frame 23 and the actuating mechanism 24.

The saw blade [2 consists of a narrow ring with ordinary saw teeth around its exterior periphery.

The blade is carried on roller bearing 21 in the guard member l3 which is of L-shape cross section and semi-circular contour fitting over the top of the teeth of the saw blade with a narrow space between, for clearance.

Withinthis guard member I3, which is'concentric with the circular saw blade I2, is secured thereto by radial arms 25, the tube frame 23, which is also of semi-circular contour, but mounted eccentrically to the guard and saw blade, and, is held to the uard l3 by bolts or rivets 26. Straps 46, see Figures 6 and 7, are also provided on the other side of the blade on the bolts 41 in the frame 23 within the guard member I3, and carrying rollers 21 upon which the saw blade I2 is supported by contacting with its inner periphery with the surfaces of the roller or ball bearings 2'! so as to run freely around in said guard member I3. On the inner surfaces of members-25 and 46; are shown guide strips 49 for the blade and a spacer block 48 (Fig. 7) in place of the bearings 21. These straps 46 can be turned down sideways as illustrated in Figure 1, by looseningbolts 41 slightly. This is in order to facilitate exchange of the saw blade in the guard member I3.

At the left side of Figure 1 is seen how the 3 guard member I3 with the frame 23 is hlngedly supported by means of a bracket 28 with a handhold 29 on the hinge bolt IS in the lug I8 of the base member I.

This rigid construction of guard members I3 and bracket," -is held.up fromethe basemember by a sptihdJO, so. thatthe saw. blade lZjQOQSLI Qt contact with the log I unless the operator forces the movable parts down by pushing on the operating handle 3| secured on the outer surface of the guard l3 or on the hand-hold! 9.

At 33 is shown a flexible shaft or; cableiwilih a switch for supplying poweritm-rotatelshafte34, mounted in a bearing 35 on the bracket .28. There are two parallel shafts .34 in l 1ousing 3 4 with meshing gears 36, 31 in-the casing35, in Figure 4. The inner ends of the shafts- 3.4 each carries a friction roller 38 or 39, one on each side of thesaw-gbladel 2. By means ,ofa clutch. member.-40.; pivoted on vtheguard lland a clutch handle 4| the two rollers 38, 39 are broughtgtogetherragainst thesaw blade ii to set-it ,re- ,volvinginthe guard.l3. See Fig. 3. -Normally, saidfriction rollers are forcedapartbya flat spring, .42- acting against the sides ofthe housings 34 for theshafts 34.

Between-the bracket 13, :the guard I 3 .and the ;frame;23 is provided.a set of,hinged 1inks-43, 44, .45- -in additionto thestifistructure ofthe bracket .lQand hand-hold 29.

{The ,operationof this machine saw is the-foll win -;Wi th;the machine sawassembled as, shown in 213s.} end- 5, v.the operator standing behind the meeh naz he is. .l' the eft of aid fi u s. =first 'itakes h 1.d ofzhendles 2| zand'fl-and p aces-the machine as .indicated in -sai d figures with the hookrendiof .theabase. m m er n :on op .of th xlog i I which isto ,becut. Thenqhepushesdown with his right; hand ion the handle 2 I until the hooks l4 firmly grip the surface of the logend :simultaneously. with his -;right hand 'presses on stbeoPerati-ng handleg=3l untilthe saw: teeth; touch stheilog. He :now :switches on the power and drawing handles :II and 4| together presses roller-523.8, 539 .:against :the-saw :blade {132, .the, latter .stants-ztmrevolvmand. cut into the-.1084}.

.Continuing his pressure ,on .hanclles 53L n, while :steadyi-ng the machine by-ithe r-handle -2I liths his right handnthe sawzwillcutfleeperyand deeper the. log.

It is to be understood that-theinvention as *herein disclosed .may be varied :from the :details described and-shown without;departure-fromrthe :spirit of thesubjoined claims.

I claim:

:1. A 'log sawing machine of *the chara ter stated, comprising .a relatively: long; baseimember :adapted -for connection :at -one end with :;a log ato be sawed, an upstanding earcarried by the member, a rigid bracket :arm pivotally tsecured tovthe carrier-oscillation; ina vertical plane, :e :n i 'o rrotet blezn we transm tt n elements r fi id s ppo ted uron;sa d b a t:ar ,.an arcu t f am rie dly connected at one end with :thepower transmitting elements, an-annular-saw qharinsic t ns te th u d ts p rinh rycmeans ncerr ed b herf smefor ota bl lipportins'the '4 saw, means forming a driving connection between the power transmitting elements and the saw whereby rotary motion is imparted to the saw, an arcuate guard member disposed around and covering substantially half the circumference of the awupon the.--side reofrremote from the base. .-,a rigid barmember secured between-tan end of the arcuate guard and said bracket and forming a;handle for facilitating maintenance of the saw in working position, and rigid radially extending connecting-members between the frame and said guard- 2. ,Alggsawing machine comprising an elonxatedcbasezmember adapted for connection with afllqg to be sawed, a rigid bracket arm pivotally mounted upon-saidbase member for oscillation in a -,vertical plane, a pair of rotatable power transmitting elements mounted upon said bracket arm, .an .arcuate frame connected at one end with r th powerrtransmittine. elements, an annularsaw having peripheral cutting ,teeth,. support means carried by the frame for rotatably supporting thesaw, ,a driving connection. means between ,the power .transmitting elements and the saw-whereby-the sawgis rotated, anarcuate guard member disposedaround and covering substantiallyhalf the circumference of the saw upon the side thereof remote .fromthe base member,. ahandle for said machine comprising a bodyrigidly connectedtor-said 'arcuate guard and. to. said. bracket arm,- meanssecuring-said guard to said frame.

,3. The.combination-,ofclaim2 including aresilient member connected to :said .base ,member and'tosaid bracketarmandyieldingly urging the former away from the latter.

v4. The; combination of claim,-2 wherein said securing imeansrcomprisetwo sets of brackets discposedio i ppositesides;of; saidsaw andconnecting said-guard said: frameroneiset ofv brackets :being remcvhblemoepermit passage of-,sai.d saw between saidsuatdnnd frame.

; 5. ,The rcombinationof claim 2: including-brace means connected to saidrbracket .arm adjacent the pivot thereof :and {rigidly 1 connected to said guard and frame.

ALBERT P.';SMITH.

REFERENCES CITED The following references are of record in the 'filecf this patent:

UNITED STATES "PATENTS Number Name Date 252,268 Silcott Jan. 10,1882 775,247 Reid Nov. 15,1904 915,808 Tevis 'Mar..23, 1909 1,063,986 Lowe et a1. June 10,1913

1,395,100 Fite Oct. 25, 1921 1,428,208 Bills v Sept..r5.-1922 1,775,692 Plut Sept. 16, :1930 1,997,619 .Windle .Apr. 16, 1935 2,310,152 Running Feb. 2, .1943 2,330,996 .Rivers .Oct. 5, 1943 FOREIGN PATENTS Number Country Date 6%,034 Austria V Mar. 26,1914 7194;235 Switzerland Feb. 1, 193,8 

